How Much Do You Know About Science Topics?

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How strong is your Science knowledge? Would you like to check? Take our online quiz and test your knowledge of science facts, terms, concepts, and applications of scientific principles.

• 1.

What is a predicted answer to a scientific question or an educated guess that may explain an observation?

Explanation
A hypothesis is a predicted answer or an educated guess that attempts to explain an observation in a scientific question. It is a proposed explanation that can be tested through further research and experimentation. A hypothesis is formulated based on prior knowledge, observations, and logical reasoning, and it serves as a starting point for scientific investigations. It helps scientists to develop theories and make predictions about the outcome of experiments. Thus, a hypothesis is a crucial step in the scientific method as it guides the research process and allows scientists to explore and understand the natural world.

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• 2.

A normal red blood cell has an average width (diameter) is between

• A.

4 and 6 micrometer

• B.

6 and 8 micrometer

• C.

3 and 4 micrometer

• D.

5 and 6 micrometer

B. 6 and 8 micrometer
• 3.

What is the measure of the average kinetic energy (energy of motion) of particles of matter called?

Temperature
Explanation
Temperature is the measure of the average kinetic energy of particles of matter. It represents the level of thermal energy present in a substance. As the particles move faster and have higher kinetic energy, the temperature increases. Conversely, when the particles move slower and have lower kinetic energy, the temperature decreases. Therefore, temperature is directly related to the average kinetic energy of particles in a substance.

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• 4.

What is the formula to convert celcius into Fahrenheit in terms of F and C  ________.

F=1.8C+32
Explanation
The formula to convert Celsius into Fahrenheit is F=1.8C+32. This formula is derived from the relationship between the Celsius and Fahrenheit temperature scales. In this formula, C represents the temperature in Celsius and F represents the temperature in Fahrenheit. To convert Celsius to Fahrenheit, you multiply the Celsius temperature by 1.8, then add 32 to the result. This will give you the equivalent temperature in Fahrenheit.

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• 5.

________ measures how much matter occupies a given amount of space

Density
Explanation
Density is a physical property that measures the amount of matter in a given volume or space. It is calculated by dividing the mass of an object by its volume. Density is an important concept in physics and chemistry as it helps determine the behavior and characteristics of substances. For example, substances with higher density tend to sink in liquids with lower density. Therefore, density is the correct answer to the question as it accurately describes the measurement of how much matter occupies a given amount of space.

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• 6.

What is the amount of force exerted per unit area

pressure
Explanation
Pressure is defined as the amount of force exerted per unit area. It is a measure of how much force is applied to a given area. The greater the force applied or the smaller the area, the higher the pressure. Pressure is commonly measured in units such as pascals (Pa) or pounds per square inch (psi).

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• 7.

What is the amount of push or pull on an object?

Force
Explanation
Force is the amount of push or pull exerted on an object. It is a vector quantity, meaning it has both magnitude and direction. Force can cause an object to accelerate, decelerate, or change direction. It is measured in units called Newtons (N).

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• 8.

What is the scattering of light by colloid particles called?

tyndall effect
Explanation
The scattering of light by colloid particles is known as the Tyndall effect. This phenomenon occurs when light passes through a medium containing small particles, causing the light to scatter in different directions. The scattered light is visible to the naked eye, creating a visible beam or cone of light. The Tyndall effect is commonly observed in everyday life, such as when sunlight passes through a dusty room, making the dust particles visible in the air.

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• 9.

Which energy is associated with the electromagnetic energy that travels in waves?

Explanation
Electromagnetic energy that travels in waves is associated with radiant energy. Radiant energy refers to the energy carried by electromagnetic waves, such as visible light, radio waves, microwaves, and X-rays. These waves are produced by the movement of electrically charged particles and can travel through a vacuum. Radiant energy is responsible for various phenomena, including heat transfer, light emission, and the transmission of information through radio and television signals.

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• 10.

A homogeneous mixture is where extremely small particles (but not as small as particles in a solution) are spread evenly throughout another substance.

• A.

True

• B.

False

A. True
Explanation
A homogeneous mixture refers to a mixture where the components are uniformly distributed and cannot be easily distinguished. In this type of mixture, the particles are evenly spread throughout the substance, although they may not be as small as particles in a solution. Therefore, the given statement that a homogeneous mixture consists of extremely small particles that are spread evenly throughout another substance is true.

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• 11.

extrinsic
• 12.

What are  solids with atoms or molecules that are locked into place, but without a specific form or repeating structure called?

amorphous
Explanation
Solids with atoms or molecules that are locked into place, but without a specific form or repeating structure are called amorphous. Amorphous materials lack a crystalline structure and do not have a well-defined shape or pattern. The atoms or molecules in amorphous solids are randomly arranged, giving them a disordered and non-uniform appearance. Examples of amorphous solids include glass, rubber, and some plastics.

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• 13.

D-type subshell has

• A.

Has seven orbitals. Each of those orbitals can hold two electrons, for a total of up to fourteen electrons

• B.

Has three orbitals. Each orbital can hold two electrons, for a total of six electrons.

• C.

Has five orbitals. Each of those orbitals can hold two electrons, for a possible total of ten electrons

• D.

Has one orbital, which can hold up to two electrons

C. Has five orbitals. Each of those orbitals can hold two electrons, for a possible total of ten electrons
Explanation
The d-type subshell has five orbitals, and each of those orbitals can hold two electrons. This means that a total of ten electrons can be accommodated in the d-type subshell.

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• 14.

What type of substance is found in all matter in the universe?

• A.

Compounds

• B.

Elements

• C.

Mixtures

• D.

All of the above

B. Elements
Explanation
Elements are the type of substance found in all matter in the universe. Elements are pure substances that cannot be broken down into simpler substances by ordinary chemical means. They are the building blocks of matter and are composed of only one type of atom. Examples of elements include hydrogen, oxygen, carbon, and gold. Compounds are formed when elements combine chemically, and mixtures are a combination of two or more substances that are not chemically bonded together. Therefore, the correct answer is elements.

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• 15.

Omar fills a graduated cylinder with 15 mL of water. He then drops a ring into the graduated cylinder and records that the water level is 19 mL. What did he measure?

• A.

The ring’s mass

• B.

The ring’s volume

• C.

The water’s density

• D.

The water’s weight

B. The ring’s volume
• 16.

The deepest part of all the world’s oceans is the Mariana Trench, which has a maximum depth of 11,000 m. How is this depth written in scientific notation?

• A.

1.1 x 10^3 m

• B.

1.1 x 10^4 m

• C.

11 x 10^3 m

• D.

11.000 x 10 m

B. 1.1 x 10^4 m
Explanation
The depth of the Mariana Trench, 11,000 m, can be written in scientific notation as 1.1 x 10^4 m. In scientific notation, the number is expressed as a decimal between 1 and 10, multiplied by a power of 10. In this case, 11,000 can be written as 1.1 multiplied by 10^4, where 10^4 represents 10 raised to the power of 4, or 10,000.

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• 17.

What is the maximum number of controlled variables that there can be in a scientific experiment?

• A.

0

• B.

1

• C.

2

• D.

There is no maximum

D. There is no maximum
Explanation
In a scientific experiment, controlled variables are the factors that are kept constant throughout the experiment to ensure that the only variable being tested is the independent variable. The maximum number of controlled variables in an experiment is not limited. Scientists can control as many variables as necessary to isolate the effect of the independent variable and obtain accurate and reliable results. Therefore, there is no maximum number of controlled variables in a scientific experiment.

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• 18.

Alexis conducts an experiment studying how long it takes different watercolor paints to dry. What is a valid independent variable for her experiment?

• A.

Brand of paint

• B.

Color of paint

• C.

Time needed to dry

• D.

Both A and B

D. Both A and B
Explanation
The valid independent variable for Alexis's experiment would be both the brand of paint and the color of paint. This means that Alexis will be testing different brands of watercolor paints as well as different colors to see how long they take to dry. By varying these two factors, Alexis can determine if there are any differences in drying time based on the brand or color of the paint.

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• 19.

The most abundant element in the universe is hydrogen, which makes up about 75% of the universe’s mass. What is the same for every particle of hydrogen in the universe?

• A.

Number of electrons

• B.

Number of neutrons

• C.

Number of protons

• D.

All the above

C. Number of protons
Explanation
Every particle of hydrogen in the universe has the same number of protons. This is because hydrogen is the simplest element, consisting of only one proton and one electron. The number of neutrons in hydrogen can vary, resulting in different isotopes of hydrogen, but the number of protons always remains the same.

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• 20.

Nathan pours himself a glass of pineapple juice. What is a qualitative property of the juice?

• A.

It freezes at −2 °C

• B.

It has a density of 1.25 g/mL

• C.

It has a volume of 240 mL

• D.

It is a yellow solution

D. It is a yellow solution
Explanation
The qualitative property of the juice is that it is a yellow solution. Qualitative properties describe the characteristics or qualities of a substance, such as its color, odor, taste, or appearance. In this case, the fact that the juice is yellow is a qualitative property because it describes its visual appearance.

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• 21.

What is true about the periodic table?

• A.

All elements can be classified as either metalloids or nonmetals

• B.

Elements are arranged in order of increasing atomic number

• C.

Elements in the same row have similar chemical properties

• D.

All the above

B. Elements are arranged in order of increasing atomic number
Explanation
The periodic table is a tabular arrangement of chemical elements, organized based on their atomic number, electron configuration, and recurring chemical properties. The statement "Elements are arranged in order of increasing atomic number" is true because the elements in the periodic table are arranged in order of their atomic numbers, which represents the number of protons in the nucleus of an atom. This arrangement allows for the elements to be grouped together based on their similar chemical properties and provides a systematic way to study and understand the behavior of different elements.

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• 22.

A food chemist is studying a solid sample. Which property is she least likely to measure?

• A.

Density

• B.

Effusion rate

• C.

Melting point

• D.

Toxicity

B. Effusion rate
Explanation
A food chemist studying a solid sample is least likely to measure the effusion rate. Effusion rate refers to the rate at which a gas escapes through a small hole, which is not applicable to a solid sample. Density, melting point, and toxicity are all properties that can be measured and analyzed in relation to a solid sample.

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• 23.

Which group of particles has the greatest mass?

• A.

1 neutron and 1 proton

• B.

1 proton and 10 electrons

• C.

2 neutrons and 10 electrons

• D.

3 neutrons

D. 3 neutrons
Explanation
The group of particles with the greatest mass is 3 neutrons. Neutrons are heavier than protons and electrons, so having three neutrons in a group would result in the highest mass compared to the other options.

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• 24.

What primarily determines the volume of an atom?

• A.

The size of the nucleus

• B.

The size of the electron cloud

• C.

The number of neutrons

• D.

The speed of the electrons

B. The size of the electron cloud
Explanation
The volume of an atom is primarily determined by the size of the electron cloud. The electron cloud is the region around the nucleus where the electrons are most likely to be found. It extends far beyond the size of the nucleus, which is relatively small compared to the entire atom. Therefore, the size of the electron cloud, which is influenced by the arrangement and energy levels of the electrons, is what primarily determines the volume of an atom.

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• 25.

An oceanographer has two liquid samples and records their masses in the table below. What must be true of samples 1 and 2? Sample 1 Mass 230 g Sample 2 Mass 230 g

• A.

They have the same chemical composition

• B.

They have the same weight

• C.

They take up the same amount of space

• D.

All the above

B. They have the same weight
Explanation
The correct answer is "They have the same weight." Weight is a measure of the force exerted on an object due to gravity, and it is directly proportional to the mass of an object. Since both Sample 1 and Sample 2 have the same mass of 230 g, they will also have the same weight. The other options are not necessarily true based on the information given.

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• 26.

Rose gold, which is often used to make jewelry, is an alloy of gold, copper, and silver. The copper gives the gold its reddish color. What is true of rose gold?

• A.

It is mixed evenly throughout

• B.

It cannot be broken down by normal chemical or physical means

• C.

It does not conduct electricity

• D.

It is a pure ternary compound

A. It is mixed evenly throughout
Explanation
Rose gold is an alloy, which means it is a mixture of different metals. In the case of rose gold, it is a mixture of gold, copper, and silver. The metals are mixed evenly throughout the alloy, resulting in its distinct reddish color. This means that there is no separation or concentration of any specific metal within the rose gold.

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• 27.

A drama teacher wants to know which shows get the most students to audition. He collects the data below and concludes that when a show has a larger cast, more students audition. What would improve his experiment? Type of show       Cast size   Number of students who auditioned Musical                  50              62 Musical                  30              60 Play                        15               30 Play                        10               27

• A.

Offering more audition times for small shows

• B.

Publicizing small shows more than large shows

• C.

Recording how many people attended each show

• D.

Testing either only plays or only musicals

D. Testing either only plays or only musicals
Explanation
The drama teacher's conclusion that shows with larger casts attract more students to audition may not be accurate because there are other factors that could influence the number of students auditioning, such as the popularity of the show or the level of interest among students. To improve the experiment, the teacher could test either only plays or only musicals, which would eliminate the potential influence of different show types on the number of auditions. This would allow for a more accurate comparison and analysis of the impact of cast size on student participation.

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• 28.

The earth’s core contains liquid nickel and iron at temperatures greater than 4,000 °C. What must be true of pure liquid nickel in the earth’s core compared to pure liquid nickel made in a factory? I. They have the same freezing point II. They have the same number of protons in each atom III. They react the same

• A.

II only

• B.

I and II only

• C.

I and III only

• D.

I, II, and III

D. I, II, and III
Explanation
Pure liquid nickel in the earth's core and pure liquid nickel made in a factory must have the same freezing point, the same number of protons in each atom, and they react the same.

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• 29.

Lotions are often stored in glass bottles to protect them from UV light. A cosmetic chemist is testing what color glass best protects a lotion. What should be his control group?

• A.

Lotion in a clear glass bottle

• B.

Lotion in a plastic bottle

• C.

Water in a clear glass bottle

• D.

Water in a plastic bottle

A. Lotion in a clear glass bottle
Explanation
The control group in this experiment should be the lotion in a clear glass bottle. The purpose of a control group is to provide a baseline for comparison. In this case, the chemist wants to test the effectiveness of different colored glass bottles in protecting the lotion from UV light. By using the lotion in a clear glass bottle as the control group, the chemist can compare the results of the other colored glass bottles to see if they provide better or worse protection. The control group helps to ensure that any observed effects are due to the color of the glass and not other factors.

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• 30.

Liquid forms on cold cans of soda after they are taken out of the refrigerator through the process of condensation. What is this liquid formed from?

• A.

Solid dust

• B.

Suspended water droplets

• C.

Tiny ice particles

• D.

Water vapor

D. Water vapor
Explanation
When a cold can of soda is taken out of the refrigerator, the surrounding air is warmer and contains water vapor. As the warm air comes into contact with the cold surface of the can, it cools down and loses its ability to hold moisture. This causes the water vapor in the air to condense and form liquid droplets on the surface of the can, resulting in the formation of liquid. Therefore, the liquid formed on the cold can of soda is from water vapor in the air.

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• 31.

How did Mendeleev predict the existence of elements that hadn’t been discovered yet?

• A.

He discovered the structure of atoms

• B.

He organized the elements based on patterns of reactivity

• C.

He related atomic number to the charge of an atom’s nucleus

• D.

He used X-rays to measure atomic numbers

B. He organized the elements based on patterns of reactivity
Explanation
Mendeleev predicted the existence of undiscovered elements by organizing the known elements based on patterns of reactivity. He arranged the elements in a periodic table according to their atomic mass and observed that elements with similar properties appeared at regular intervals. By identifying the gaps in the table, Mendeleev predicted that there must be elements with specific properties that were yet to be discovered. This prediction was later proven correct when the predicted elements were discovered and found to fit into the patterns Mendeleev had observed.

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• 32.

Silver chloride, AgCl, is a temperature-stable lightweight solid that darkens in sunlight. As a result, AgCl is used in glasses that darken in bright light. What chemical property of AgCl explains its use in glasses?

• A.

It does not dissolve in water

• B.

It reacts to form Ag and Cl atoms in UV light

• C.

Its density is 5.56 g/cm3

• D.

Its melting point is 455 °C

B. It reacts to form Ag and Cl atoms in UV light
• 33.

A ball is rolling down a hill. What type of energy is the ball gaining? I. Kinetic energy II. Mechanical energy III. Potential energy

• A.

I only

• B.

III only

• C.

I and II only

• D.

II and III only

A. I only
Explanation
As the ball is rolling down the hill, it is gaining kinetic energy. Kinetic energy is the energy possessed by an object due to its motion. The ball is moving, which means it has kinetic energy. Mechanical energy refers to the sum of potential and kinetic energy, but in this case, only kinetic energy is being gained by the ball. Potential energy is the energy stored in an object due to its position or state, but as the ball is rolling down the hill, it is not gaining potential energy. Therefore, the correct answer is I only.

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• 34.

Element X reacts similarly to oxygen and has the same number of electron shells as silicon. Based on rows two and three of the periodic table, shown below, what is element X?

• A.

Boron

• B.

Carbon

• C.

Nitrogen

• D.

Sulfur

D. Sulfur
Explanation
Element X has the same number of electron shells as silicon, which is located in row three of the periodic table. Looking at the options, sulfur is the only element in row three. Therefore, sulfur is the correct answer.

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• 35.

Personal opinion is not a step in the scientific method.

• A.

True

• B.

False

A. True
Explanation
The scientific method is a systematic approach used to investigate and understand phenomena in the natural world. It involves making observations, formulating hypotheses, conducting experiments, and analyzing data to draw conclusions. Personal opinion, on the other hand, is subjective and not based on empirical evidence or logical reasoning. It is influenced by individual beliefs, emotions, and biases. Therefore, personal opinion does not have a place in the scientific method, which relies on objective and evidence-based approaches to gain knowledge and understanding.

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• 36.

The dependent variable is the variable you are going to change in the experiment.

• A.

True

• B.

False

B. False
Explanation
The dependent variable is not the variable you are going to change in the experiment. It is the variable that is being measured or observed to determine the effect of the independent variable. The independent variable is the variable that is intentionally manipulated or changed in the experiment. Therefore, the correct answer is false.

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• 37.

Theories are definite facts.

• A.

True

• B.

False

B. False
Explanation
The statement "Theories are definite facts" is false. Theories are not definite facts, but rather explanations or models that are based on evidence and observations. They are subject to change and revision as new evidence emerges. Theories are used to explain and understand phenomena, but they are not absolute truths. They are constantly tested and refined through scientific methods. Therefore, theories should not be confused with facts, which are statements that can be proven to be true.

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• 38.

Precision is to be able to take the same measurement and get the same result over and over again.

• A.

True

• B.

False

A. True
Explanation
Precision refers to the consistency and repeatability of measurements. If a measurement is precise, it means that when the same measurement is taken multiple times, it will yield the same result each time. Therefore, the statement "Precision is to be able to take the same measurement and get the same result over and over again" is true.

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• 39.

An element is a pure substance that can be broken down by normal chemical or physical means.

• A.

True

• B.

False

B. False
Explanation
An element is a pure substance that cannot be broken down by normal chemical or physical means. Elements are the simplest form of matter and are composed of only one type of atom. They cannot be further broken down into simpler substances. This is the basis of the periodic table, where elements are organized based on their atomic number and properties.

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• 40.

The two allotropes of oxygen are water and ozone.

• A.

True

• B.

False

B. False
Explanation
The statement is false. Water and ozone are not allotropes of oxygen. Allotropes are different forms of the same element, but water is a compound made up of two hydrogen atoms and one oxygen atom, while ozone is a molecule made up of three oxygen atoms. Oxygen itself exists in two allotropes, namely oxygen gas (O2) and ozone (O3).

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• 41.

A solution is a heterogeneous mixture in liquid or gas form.

• A.

True

• B.

False

B. False
Explanation
A solution is actually a homogeneous mixture, not a heterogeneous one. In a solution, the solute (the substance being dissolved) is evenly distributed throughout the solvent (the substance doing the dissolving), resulting in a uniform composition. This can occur in both liquid and gas forms. Therefore, the correct answer is false.

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• 42.

Colloids, sols, gels, foams, aerosols, and emulsions are examples of homogeneous solutions.

• A.

True

• B.

False

B. False
Explanation
The given statement is false because colloids, sols, gels, foams, aerosols, and emulsions are examples of heterogeneous solutions, not homogeneous solutions. In a homogeneous solution, the solute particles are uniformly distributed throughout the solvent, whereas in a heterogeneous solution, the solute particles are not evenly distributed and can be seen as separate phases.

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• 43.

The surface tension of water can hold up a more dense solid object, such as a needle.

• A.

True

• B.

False

A. True
Explanation
The surface tension of water is a result of the cohesive forces between water molecules. These forces create a "skin" on the surface of water that can support the weight of certain objects. In the case of a needle, its density is higher than that of water, but the surface tension is strong enough to hold it up. This phenomenon is often demonstrated by placing a needle gently on the surface of water, where it will float due to the surface tension. Therefore, the statement is true.

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• 44.

The Lanthanide and Actinide series elements are called the inner transition metals.

• A.

True

• B.

False

A. True
Explanation
The Lanthanide and Actinide series elements are referred to as the inner transition metals because they are located in the f-block of the periodic table, which is positioned between the s-block and d-block. These elements have their outermost electrons in the f-orbital, which gives them unique electronic configurations and properties. The inner transition metals are known for their similar chemical behaviors and the ability to form complex compounds.

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• 45.

Halogens are not highly reactive.

• A.

True

• B.

False

B. False
Explanation
The statement "Halogens are not highly reactive" is false. Halogens, such as fluorine, chlorine, bromine, iodine, and astatine, are highly reactive elements. They have a tendency to gain an electron to achieve a stable electron configuration, making them strong oxidizing agents. They readily form compounds with other elements and can react vigorously with metals, nonmetals, and even water. Therefore, the correct answer is false.

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• 46.

Thermistors are used to measure temperature.

• A.

True

• B.

False

A. True
Explanation
Thermistors are temperature-sensitive resistors that are commonly used to measure temperature. They exhibit a change in resistance with a change in temperature, making them suitable for temperature measurement applications. By measuring the resistance of a thermistor, the temperature can be determined accurately. Therefore, the statement "Thermistors are used to measure temperature" is true.

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• 47.

Liquids, gases, and plasmas are fluids.

• A.

True

• B.

False

A. True
Explanation
Liquids, gases, and plasmas are considered fluids because they all have the ability to flow and take the shape of their containers. Unlike solids, which have a fixed shape and volume, fluids are able to move and change their shape easily. Liquids, such as water, can flow and take the shape of their container but have a fixed volume. Gases, like air, can expand to fill their container completely. Plasmas, on the other hand, are ionized gases and can conduct electricity. Overall, all three states of matter exhibit fluid-like behavior, making the statement true.

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• 48.

________ is a measure of the pull of gravity between an object and the earth (or the planets, sun, etc.).

weight
Explanation
Weight is a measure of the pull of gravity between an object and the earth (or other celestial bodies). It is a force that is exerted on an object due to gravity. The weight of an object is directly proportional to its mass, meaning that as the mass of an object increases, its weight also increases. Weight is typically measured in units such as pounds or kilograms.

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